Asteroidea

Asteroidea (starfish; subphylum Asterozoa, class Stelleroidea) A subclass which includes all extant starfish, characterized by the possession of poorly demarcated, broad arms containing a large coelomic cavity. The open ambulacral grooves bear rows of large tube feet which are used especially in feeding and locomotion. Respiration takes place through external gills (papulae) which are restricted to the aboral surface. Asteroids occur from the Ordovician to the present.

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starfish

starfish Any marine echinoderms with a central disc body and a five-rayed symmetry resulting in five to 40 radiating arms. The mouth is on the underside of the disc and the stomach can be extruded to digest other echinoderms and shellfish. Calcareous spines are embedded in the skin. Starfish move by means of tube feet, which they may also use for pulling open the bivalve molluscs on which they feed. Class Asteroidea.

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starfish

star·fish
/ ˈstärˌfish/
•
n.
(pl. same or -fishes)
a marine echinoderm (class Asteroidea) with five or more radiating arms. The undersides of the arms bear tube feet for locomotion and, in predatory species, for opening the shells of mollusks.

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